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Elastomer cushion ring for a random tooth roller chain sprocket

a technology of elastomer cushion rings and random teeth, which is applied in the field of cushion rings, can solve the problems of creating undesirable chain engagement noise and disrupting repetitive chain engagement noise orders, and achieve the effects of reducing noise, reducing chain roller and/or bushing engagement impact force, and increasing roller/bushing fatigue li

Inactive Publication Date: 2006-04-06
BORGWARNER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a sprocket with a cushion ring made of elastomer material that is designed to reduce noise, vibration, and harshness (NVH) levels while improving durability. The cushion ring has a specific geometry that changes the amount of interference with the chain for each rotation of the sprocket. The elastomer material compresses during chain engagement, reducing impact forces and increasing the fatigue life of the chain. The sprocket also includes a root structure with different root radii to ensure equal distances between the centers of adjacent rollers. Overall, the invention improves the performance and durability of the sprocket.

Problems solved by technology

Repetitive sprocket tooth spacing is known to create undesirable chain engagement noise having orders that are related to the number of sprocket teeth.
A random tooth sprocket has both irregular angular spacing and varying pitch radii of the sprocket teeth which disrupts the repetitive chain engagement noise orders.

Method used

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  • Elastomer cushion ring for a random tooth roller chain sprocket
  • Elastomer cushion ring for a random tooth roller chain sprocket
  • Elastomer cushion ring for a random tooth roller chain sprocket

Examples

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Embodiment Construction

[0024] Referring to FIGS. 1-9, a random tooth chain sprocket 10 having a set of teeth 12 circumferentially distributed upon its circumference is shown. Random tooth chain sprocket 10 may be used in conjunction with a roller chain 13 having random tooth chain sprocket 10 with a plurality of roots with the first root radius and a plurality of roots with the second root radius. The roots having the first root radius are randomly arranged with the roots having the second root radius in a predetermined pattern about the random tooth chain sprocket 10 periphery. By randomly arranged, it is meant that the pattern is staggered between first and second radii, and not a pure alternating pattern between first and second radii. For detailed description of the random tooth sprocket, refer to U.S. Pat. No. 6,155,943, which is hereby incorporated herein by reference. A random sprocket comprises two or more radii for locating the tooth roots. In the preferred embodiment of the present invention, th...

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Abstract

A sprocket is provided with a plurality of teeth spaced about its periphery, the sprocket including roots located between pairs of adjacent teeth. The roots have root radii defined as the distance between the center of sprocket and the point along the root closest to the sprocket center in the radial direction. Roots have three distinct radii. a cushioning material for receiving the impact while engaging a chain has a geometry means substantially following the contours of the sprocket teeth geometry.

Description

FIELD OF THE INVENTION [0001] The invention pertains to the field of cushion rings. More particularly, the invention pertains to elastomer cushion rings that are bonded to at least one side of a random tooth roller chain sprocket BACKGROUND OF THE INVENTION [0002] Randomized sprockets for roller chain are known. U.S. Pat. No. 6,155,943, which is hereby incorporated herein by reference, discloses a roller chain and sprocket drive with a randomized sprocket which modulates the roller position on the sprocket by varying the radial seating position of the roller while maintaining a constant chordal dimension between seated rollers. The roots between teeth of the sprocket have radii that vary between a nominal radius and a maximum radius and a minimum radius. This variation or randomization is intended to provide a noise modulation effect while avoiding the negative effects of high impact from conventional randomized sprockets. [0003] It is also known to use roller chain sprockets, which...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16H55/06F16H55/30F16H55/36
CPCF16H55/30F16H2055/306
Inventor HAESLOOP, J. CHRISTIAN
Owner BORGWARNER INC
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